Metallic piston-packing.



F, WACKENHUTH. METALLIC PISTON PACKING.

APPLICATION FILED JUNE 4. 1918.

Patented Sept. 24, 1918.

z w m m 61cm neg UNITED STATES FATE @FFIQE,

FREDERICK WACKENHUTH, 0F NEWARK, NEW JERSEY, ASSIGNOR T0 STEWART S.

. KUR'IZ, SE, OF CANTON, OHIO.

METALLIC PISTON-PACKING.

Patented Sept. 24, 918.

Original application filed September 30, 1915, Serial No. 53,401.Divided and this application filed June 4, 1918.. Serial No. 238,119.

To all whom it may concern:

Be it known that I, FREDERICK WAOKEN- HUTH, a citizen of the UnitedStates, residing at Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in MetallicPiston-Packings, of which the following is a specification, referencebeing had therein to the accompanying drawing.

My invention relates to improvements in metallic piston packings, andwhile designed and intended more particularly for use in internalcombustion engines, it is adapted to be. used in all places where anefiicient metallic piston packing is desirable.

The object of my invention is to provide a three-piece metallic pistonring, so constructed and so arranged that an improved packing effect isaccomplished.

The present invention relates to that class of metalli piston rings,which are made up of an inner open eccentric ring, and two open outereccentric rings embracing the inner ring, and of a combined width equalto the width of the inner ring.

The present invention may be characterized as comprising one innereccentric spring expanding ring and two outer independent eccentricexpansible rings, the inner ring having an opening in its thin side, andthe outer rings having openings in their thin sides, the outer ringsarranged on the inner ring with their thin sides at the thick side ofthe inner ring, and their openings out of communication.

By this construction and relative arrangement of the three piece ring,the tapering independent flexible ends of the outer rings cause them totightly conform to the outer engaging surface of the inner ring and tothe cylinder wall in which the packing is used, and the relativearrangement of the thick andthin portions of the three rings causes themto conform to each other and to the cylinder wall, which provides ahighly improved fit between the inner and outer rings, and between theouter rings and the cylinder wall.

In the accompanying drawings- Fig. 1 is a horizontal sectional view onthe line 22 of Fig; 2.

Fig. 2 is an edge view, and

Fig. 3 is a perspective view of my improved ring.

Referring now to the drawings, 1 represents a portion of the pistonbody, which is provided with one or more annular grooves (not shown) toreceive a piston packing or packings, as is well understood by thoseskilled in this art.

In carrying out my present improvement, I provide an inner eccentricspring expanding ring 2, which has an opening 2', in its thin portion,thus forming two tapering spring expanding ends 4:.

Surrounding and embracing this inner eccentric ring 2, are two outereccentric rings 3 and 5, each of which is provided with an opening 6 inits thin portion, which form two flexible tapering ends 7 for each outereccentric ring. These outer rings 3 and. 5 are of a combined width equalto a width of the single inner ring 2, as shown, and they are placededge to edge, as shown in Fig. 2, with their adjacent edges inengagement.

Attention is directed to the fact, that the inner and outer rings areassembled so that the thin portions of the outer rings are at the thickportion of the inner ring, and the openings 6 of the outer rings are outof line. The three rings are held in the assembled relative positionsjust described when in working positions by means of a pin 8, and theprimary function of the pin is to hold the three rings in the describedrelative positions. As here shown, the pin 8 passes into the piston body1, but it is not necessary to lock the rings to the piston, as will bereadily understood by those skilled in the art, and the pin '8 need nottherefore extend into the piston body 1, in order provement.

Attention is also directed to the fact, that the pin 8, and the groovesor openings 9 in the outer rings 3 and 5, are located on an imaginaryline 10 crossing the exact center of the rings, whereby the two rings 3and 5 are duplicates. That is to say, by this arrangement either ringmay be used in the position of the other, and this is, quite anadvantage in manufacture, in that only one form of outer ring is made,for it is adapted to be used in both positions on the inner ring, thusmaking up from a single form of to carry out my imthe inner ring, and asingle form of outer ring, the three piece ring arranged as here shownand for the purpose described-a three ring structure made from two formsof rings.

Also by the described construction and arrangement of outer rings, oneof the thin ends of each ringoverlaps and closes the opening of theouter ring, Wherebyan improved closure is provided at the expansionspace zone of the outer ring.

The inner ring is spring expanding, and by arranging the inner and outereccentric rings in the relative positions here shown and described, thetapered ends of the outer rings tightly conform to the outer engagingsurface of the inner ring and the inner cylinder Wall, whereby animproved packing against the escape of pressure is accomplished.

It will be understood of course that the relative thicknesses of theinner and outer rings may vary from that shown without departing fromthe scope of my invention, so long as they maintain the construction andrelative arrangement hereinafter pointed out in the claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is-- 1. In a metallic expansible piston packing, thecombination of an inner eccentric spring ring having an opening in itsthin side, and of a diameter smaller than the inner diameter of thecylinder in which it is used, an outer eccentric spring ring having anopening in its thin side and at a predetermined side of an imaginaryline radially crossing the exact center of the thicker and thinnersides, a duplicate of said outer ring and both mounted side by side onsaid inner ring so that said imaginary line of each and the thicker andthinner sides match so that the said openings do not come one oppositethe other, whereby their ends overlap, and so that the thicker sides ofboth are at the thinner side of said inner ring, whereby the outer ringsconform to the inner ring and to the cylinder wall, and the pair ofouter rings when side by side are equal in width to that of said innerring, and means for holding said rings from relatively rotating, and inconcentric form.

2. In a metallic expansion piston packing, the combination of an innereccentric spring expanding ring open in its thin side, two outereccentric expansible rings having openings in their thin sides but outof communication and mounted on said inner ring side by side with thethick side of the inner ring at the thin open sides of the outer ringsand the opening of the inner ring at the thick sides of the outer ringsand means for locking the three rings in their said positions, thusproviding two independent cyl-' inder bearing rings having their endsgradually tapering into the thick portion thereof, Whereby there isindependent flexibility of the outer rings and their outer surfaces arecaused to conform to the cvlinder wall and their inner surfaces causedto conform to the inner ring, thus making an improved closure betweenthe outer surfaces of the outer rings and cylinder, and an improvedclosure of the expansion space zone of the outer rings.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

- FREDERICK WACKENHUTH.

Witnesses:

W. L. MORGAN, WALTER DELBITT.

